I am using this mutation to create products using the admin graphql api: mutation productCreate($input: ProductInput!) {    productCreate(input: $input) {        product {            id            title            bodyHtml            productType     ...

I switched to using the admin graphql api and I am able to create the cart and get a working url now! But I had to query the store for the legacy id of the default variant so that I could upload the custom photo of the product as 64bit encoded image ...

Your asumptions are correct. I guess I should just use the GraphQL interfaces and forget about the REST interfaces

Hello. I am creating a product, it's metafield, and image using the Admin API. I want to return a URL to the cart with the product selected and a quantity of 1. This is the response of the POST Product request /admin/api/2021-10/products.json: {    "...